Ok here it is to clarify my statement. I had already 7b in port I had already open multiple tabs open. One of which was ship factory. I plan to create a drone to support my 7b of credits in port I made an auto creation which was a max of my drone bay. I didn't close that tab. In that time I had only 0.5b credits. I sent my drones to the port after that I back to the ship factory. It had a negative 0.25b of drones. I erase the negative in ship factory and then I accedintally cleck the build factory and it build 250 millions of drone.... during that time I try to figure it out it takes me a daya to fully understands the bugs. After that I made 6 b of drone.